Carbon-13 NMR spectra of some chlorins and other chlorophyll degradation products
The 13C NMR spectra of the methyl esters of phaeophorbides-a and -b, mesophaeophorbides-a and -b, pyrophaeophorbide-a, mesopyrophaeophorbide-a, chlorin-e6, mesochlorin-e6, chlorin-p6, rhodin-g7, mesorhodin-g7, phaeoporphyrin-a5, 2-vinylphaeoporphyrin-a5, rhodoporphyrin-XV, and 2-vinylrhodoporphyrin-XV, and of trans-octaethylchlorin, in deuteriochloroform and/or trifluoroacetic acid solution are reported. On the basis of comparisons within this comprehensive series and proton off-resonance decoupled spectra, assignments of most resonances are made; complete assignment of the quaternary "pyrrole" ring carbons was difficult to accomplish. A downfield shift of the α- and β-meso-carbons of chlorins in trifluoroacetic acid relative to deuteriochloroform is used to confirm that the Chlorobium chlorophylls (660) from Chloropseudomonas ethylicum are meso-methylated at the δ-position. © 1975.
Publication Source (Journal or Book title)
Smith, K., & Unsworth, J. (1975). Carbon-13 NMR spectra of some chlorins and other chlorophyll degradation products. Tetrahedron, 31 (4), 367-375. https://doi.org/10.1016/0040-4020(75)80047-0